Yes we have used the hire machines several times in the past. They work very well, but they are big, heavy and awkward to manoeuvre in small rooms, you really need to remove all or as much furniture as possible. The cleaning solution is very effective, and although the extra spot treatments and sprays may seem like an unnecessary expense, they are worth it especially if you have pets.
We were so impressed by the hire machines that we bought the domestic version which is a bit smaller. We do our carpets (only have bedroom and stair carpets) every couple of months and they come up lovely and soft and fluffy again, and of course clean!